'================================================================
'= 文字列のスクロール

'=    (TextScroll.bas)
'================================================================
#include "Windows.bi"

' ウィンドウにメッセージを送信。この関数は、指定したウィンドウのウィンドウプロシージャが処理を終了するまで制御を返さない
Declare Function Api_SendMessage& Lib "user32" Alias "SendMessageA" (ByVal hWnd&, ByVal wMsg&, ByVal wParam&, ByVal lParam&)

#define SB_LINERIGHT 1                  '右矢印ボタンクリック
#define SB_LINELEFT 0                   '左矢印ボタンクリック
#define SB_LINEUP 0                     '上向きの矢印ボタンクリック
#define SB_LINEDOWN 1                   '下向きの矢印ボタンクリック
#define WM_HSCROLL &H114                '水平スクロールバーを調整している
#define WM_VSCROLL &H115                'ユーザーが垂直スクロールバーを調整した

Var Shared Edit1 As Object

Edit1.Attach GetDlgItem("Edit1") : Edit1.SetFontSize 14

'================================================================
'=
'================================================================
Declare Function EditHScroll(hWnd As Long, bScrollRight As Integer, LenTxt As Long) As Long
Function EditHScroll(hWnd As Long, bScrollRight As Integer, LenTxt As Long) As Long
    Var Txt  As Long
    
    If bScrollRight Then
        For Txt = 1 To LenTxt
            EditHScroll = Api_SendMessage(hWnd, WM_HSCROLL, SB_LINERIGHT, ByVal 0)
        Next
    Else
        For Txt = 1 To LenTxt
            EditHScroll = Api_SendMessage(hWnd, WM_HSCROLL, SB_LINELEFT, ByVal 0)
        Next
    End If
End Function

'================================================================
'=
'================================================================
Declare Function EditVScroll(hWnd As Long, bScrollUp As Integer, LenTxt As Long) As Long
Function EditVScroll(hWnd As Long, bScrollUp As Integer, LenTxt As Long) As Long
    Var Txt  As Long
    
    If bScrollUp Then
        For Txt = 1 To LenTxt
            EditVScroll = Api_SendMessage(hWnd, WM_VSCROLL, SB_LINEUP, ByVal 0)
        Next
    Else
        For Txt = 1 To LenTxt
            EditVScroll = Api_SendMessage(hWnd, WM_VSCROLL, SB_LINEDOWN, ByVal 0)
        Next
    End If
End Function

'================================================================
'=
'================================================================
Declare Sub MainForm_Start edecl ()
Sub MainForm_Start()
    Var txt As String

    For i = 0 To 19
        For j = 65+i To 120+i
            txt = txt & Chr$(j)
        Next
        txt = txt & Chr$(13, 10)
    Next
    Edit1.SetWindowText txt
End Sub

'================================================================
'=
'================================================================
Declare Sub Button1_on edecl ()
Sub Button1_on()
    Var Ret As Long
    Ret = EditHScroll(Edit1.GethWnd, False, 5)
End Sub

'================================================================
'=
'================================================================
Declare Sub Button2_on edecl ()
Sub Button2_on()
    Var Ret As Long
    Ret = EditHScroll(Edit1.GethWnd, True, 5)
End Sub

'================================================================
'=
'================================================================
Declare Sub Button3_on edecl ()
Sub Button3_on()
    Var Ret As Long
    Ret = EditVScroll(Edit1.GethWnd, False, 1)
End Sub

'================================================================
'=
'================================================================
Declare Sub Button4_on edecl ()
Sub Button4_on()
    Var Ret As Long
    Ret = EditVScroll(Edit1.GethWnd, True, 1)
End Sub

'================================================================
'=
'================================================================
While 1
    WaitEvent
Wend
Stop
End